Get a tub of this smithie and give them a good coating every few weeks.
And put them in the sun after applying.they seem to soak up the renapur better in the sun.
And give the back of the ankle area a good coating aswell as they will split there if the leather drys out to much.
And another thing that helps when walking miles in them. adjust the laces like this as it takes a lot of the stiffness out of the front were They bend.
Sounds daft but it works for me.